Learning objective
Define rate of reaction as the speed at which reactants are used up or products are formed.
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Rate of reaction
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Calculating rates of reactions
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Define rate of reaction as the speed at which reactants are used up or products are formed
- This point belongs to Rate of reaction, especially Calculating rates of reactions.
- You need to be able to define rate of reaction as the speed at which reactants are used up or products are formed.
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Why does rate of reaction?
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In Chemistry, this page helps you answer questions about rate of reaction within Rate of reaction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are rate of reaction and mean rate.
Key terms
- rate of reaction: The speed at which reactants are used up or products are formed in a chemical reaction. In AQA GCSE Chemistry 8462, use this term specifically when explaining rate of reaction, collision theory, reversible reactions, equilibrium, catalysts, graph gradients, or Le Chatelier's principle.
- mean rate: The average speed of a reaction calculated using the quantity of reactant used or product formed divided by the time taken. In AQA GCSE Chemistry 8462, use this term specifically when explaining rate of reaction, collision theory, reversible reactions, equilibrium, catalysts, graph gradients, or Le Chatelier's principle.
Common trap
Misidentifying the rate unit: Always pair the rate with the appropriate unit that matches the measured quantity: if you are using mass, use g s⁻¹; if volume, use cm³ s⁻¹; if moles, use mol s⁻¹. Write the unit as a fraction (e.g., g s⁻¹) rather than a product (g s).
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Open revision notesRelated learning objectives
- Calculate mean rate of reaction using quantity of reactant used divided by time taken. (MS 1a)
Calculating rates of reactions
- Calculate mean rate of reaction using quantity of product formed divided by time taken. (MS 1a)
Calculating rates of reactions
- Use units such as g/s, cm3/s or mol/s for rate of reaction calculations.
Calculating rates of reactions
- Interpret rate data from tables and graphs.
Calculating rates of reactions
- Draw and use tangents to estimate rate of reaction at a specific time from a curve. (MS 3b, MS 3c)
Calculating rates of reactions